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[3.12] gh-126618: fix repr(itertools.count(sys.maxsize)) (GH-127048) (#127510)

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(cherry picked from commit 930ba0ce60)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
This commit is contained in:
Sergey B Kirpichev 2024-12-02 17:19:59 +03:00 • committed by GitHub
parent 34137cbd23
commit 34fe4af8a2
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3 changed files with 28 additions and 6 deletions
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23
Lib/test/test_itertools.py
View file

@ -623,6 +623,15 @@ def test_count(self):
self.assertEqual(next(c), -8)
self.assertEqual(repr(count(10.25)), 'count(10.25)')
self.assertEqual(repr(count(10.0)), 'count(10.0)')
self.assertEqual(repr(count(maxsize)), f'count({maxsize})')
c = count(maxsize - 1)
self.assertEqual(repr(c), f'count({maxsize - 1})')
next(c) # c is now at masize
self.assertEqual(repr(c), f'count({maxsize})')
next(c)
self.assertEqual(repr(c), f'count({maxsize + 1})')
self.assertEqual(type(next(count(10.0))), float)
for i in (-sys.maxsize-5, -sys.maxsize+5 ,-10, -1, 0, 10, sys.maxsize-5, sys.maxsize+5):
# Test repr
@ -703,6 +712,20 @@ def test_count_with_stride(self):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
self.pickletest(proto, count(i, j))
c = count(maxsize -2, 2)
self.assertEqual(repr(c), f'count({maxsize - 2}, 2)')
next(c) # c is now at masize
self.assertEqual(repr(c), f'count({maxsize}, 2)')
next(c)
self.assertEqual(repr(c), f'count({maxsize + 2}, 2)')
c = count(maxsize + 1, -1)
self.assertEqual(repr(c), f'count({maxsize + 1}, -1)')
next(c) # c is now at masize
self.assertEqual(repr(c), f'count({maxsize}, -1)')
next(c)
self.assertEqual(repr(c), f'count({maxsize - 1}, -1)')
def test_cycle(self):
self.assertEqual(take(10, cycle('abc')), list('abcabcabca'))
self.assertEqual(list(cycle('')), [])

2
Misc/NEWS.d/next/Library/2024-11-20-08-54-11.gh-issue-126618.ef_53g.rst Normal file
View file

@ -0,0 +1,2 @@
Fix the representation of :class:`itertools.count` objects when the count
value is :data:`sys.maxsize`.

9
Modules/itertoolsmodule.c
View file

@ -3981,7 +3981,7 @@ typedef struct {
fast_mode: when cnt an integer < PY_SSIZE_T_MAX and no step is specified.
assert(cnt != PY_SSIZE_T_MAX && long_cnt == NULL && long_step==PyLong(1));
assert(long_cnt == NULL && long_step==PyLong(1));
Advances with: cnt += 1
When count hits Y_SSIZE_T_MAX, switch to slow_mode.
@ -4037,9 +4037,6 @@ itertools_count_impl(PyTypeObject *type, PyObject *long_cnt,
PyErr_Clear();
fast_mode = 0;
}
else if (cnt == PY_SSIZE_T_MAX) {
fast_mode = 0;
}
}
} else {
cnt = 0;
@ -4071,7 +4068,7 @@ itertools_count_impl(PyTypeObject *type, PyObject *long_cnt,
else
cnt = PY_SSIZE_T_MAX;
assert((cnt != PY_SSIZE_T_MAX && long_cnt == NULL && fast_mode) ||
assert((long_cnt == NULL && fast_mode) ||
(cnt == PY_SSIZE_T_MAX && long_cnt != NULL && !fast_mode));
assert(!fast_mode ||
(PyLong_Check(long_step) && PyLong_AS_LONG(long_step) == 1));
@ -4143,7 +4140,7 @@ count_next(countobject *lz)
static PyObject *
count_repr(countobject *lz)
{
if (lz->cnt != PY_SSIZE_T_MAX)
if (lz->long_cnt == NULL)
return PyUnicode_FromFormat("%s(%zd)",
_PyType_Name(Py_TYPE(lz)), lz->cnt);